/*
 * Copyright (C) 2013 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.collect.testing.google;

import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.Maps;
import com.google.common.collect.SetMultimap;
import com.google.common.collect.Sets;
import com.google.common.collect.testing.Helpers;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.MapFeature;
import com.google.common.testing.EqualsTester;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.junit.Ignore;

/**
 * Testers for {@link SetMultimap#asMap}.
 *
 * @param <K> The key type of the tested multimap.
 * @param <V> The value type of the tested multimap.
 * @author Louis Wasserman
 */
@GwtCompatible
@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
public class SetMultimapAsMapTester<K, V> extends AbstractMultimapTester<K, V, SetMultimap<K, V>>
{
    public void testAsMapValuesImplementSet()
    {
        for (Collection<V> valueCollection : multimap().asMap().values())
        {
            assertTrue(valueCollection instanceof Set);
        }
    }

    public void testAsMapGetImplementsSet()
    {
        for (K key : multimap().keySet())
        {
            assertTrue(multimap().asMap().get(key) instanceof Set);
        }
    }

    @MapFeature.Require(SUPPORTS_REMOVE)
    public void testAsMapRemoveImplementsSet()
    {
        List<K> keys = new ArrayList<>(multimap().keySet());
        for (K key : keys)
        {
            resetCollection();
            assertTrue(multimap().asMap().remove(key) instanceof Set);
        }
    }

    @CollectionSize.Require(SEVERAL)
    public void testEquals()
    {
        resetContainer(
                Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k1(), v0()), Helpers.mapEntry(k0(), v3()));
        Map<K, Collection<V>> expected = Maps.newHashMap();
        expected.put(k0(), Sets.newHashSet(v0(), v3()));
        expected.put(k1(), Sets.newHashSet(v0()));
        new EqualsTester().addEqualityGroup(expected, multimap().asMap()).testEquals();
    }

    @CollectionSize.Require(SEVERAL)
    public void testEntrySetEquals()
    {
        resetContainer(
                Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k1(), v0()), Helpers.mapEntry(k0(), v3()));
        Set<Entry<K, Collection<V>>> expected = Sets.newHashSet();
        expected.add(Helpers.mapEntry(k0(), (Collection<V>) Sets.newHashSet(v0(), v3())));
        expected.add(Helpers.mapEntry(k1(), (Collection<V>) Sets.newHashSet(v0())));
        new EqualsTester().addEqualityGroup(expected, multimap().asMap().entrySet()).testEquals();
    }

    @CollectionSize.Require(SEVERAL)
    @MapFeature.Require(SUPPORTS_REMOVE)
    public void testValuesRemove()
    {
        resetContainer(
                Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k1(), v0()), Helpers.mapEntry(k0(), v3()));
        assertTrue(multimap().asMap().values().remove(Collections.singleton(v0())));
        assertEquals(2, multimap().size());
        assertEquals(Collections.singletonMap(k0(), Sets.newHashSet(v0(), v3())), multimap().asMap());
    }
}
